Magnetics Catalog
64Pages

3 Full-scale ranges from 35 mG to 350 kG > DC measurement resolution to 0.02 mG Basic DC accuracy of 0.05% DC to 50 kHz frequency range (probe-dependent) 15 band-pass and 3 low-pass AC filters Peak capture to 20 ѵs pulse widths Data buffer sampling rates to 1000 readings per s > Lake Shore combined the technical advantages of digital signal processing with over a decade of experience in precision magnetic field measurements to produce the first commercial digital signal processor (DSP) based Hall effect gaussmeter, the Model 475. DSP technology creates a solid foundation for accurate,...

The Probe Connection The Model 475 is only half of the magnetic field measurement equation. For the complete solution, Lake Shore offers a full complement of standard and custom Hall effect probes in a variety of sizes and sensitivities. See page 26 for complete details on properly selecting a Hall effect probe. See pages 29 38 for a complete listing of available probe models. Peak Measurement Mode Pulsed fields are measured in Peak mode, which is a natural extension of the high-speed data acquisition necessary for DSP operation. Fast instrument sample rates permit capture of positive and...

Frequency Display: When operating in RMS mode, the gaussmeter can display the frequency of the measured AC field along with a field reading (up to 20 kHz). > The Model 475 offers a variety of features to enhance the usability and convenience of the gaussmeter. The Model 475 has several capabilities that allow the best possible measurements with Lake Shore probes. These firmware-based features work in tandem with the probes calibration and programming to ensure accurate, repeatable measurements and ease of setup. Many of the features require probe characteristics that are stored in the probe...

Display Keypad Voltage Output 2 The Model 475 has a 2-line by 20-character vacuum fluorescent display. During normal operation, the display is used to report field readings and give results of other features such as max/min or relative. The display can also be configured to show probe temperature or frequency. When setting instrument parameters, the display gives the operator meaningful prompts and feedback to simplify operation. The operator can also control display brightness.Following are four examples of the various display configurations: The instrument has a 22-position keypad with...

L (in)D (in)A (in)Active area (in)Stem materialFrequency rangeUsable full scale ranges Corrected accuracy (% rdg)Operating temp range (װC)Temp coefficient (max) zeroTemp coefficient (max) calibrationContains temp sensorHMNA-1904-VR 4 0.1250.187 dia ѱ0.0050.005 0.0030.030 dia (approx)Fiberglass epoxyDC to 20 kHz HSE 3.5 G, 35 G, 350 G, 3.5 kG, 35 kGѱ0.20% to 30 kG and 0.25% 30 to 35 kG0 ѰC to +75 Cб0.09 G/Cб0.04%/CYes HMMA-2502-VR 2 б0.0630.25 dia 0.0060.015 ѱ0.005AluminumDC to 10 kHz HMNA-1904-VF 4 0.1250.187 dia ѱ0.0050.005 0.003Fiberglass epoxyDC to 800 Hz HST-4 35 G, 350 G, 3.5...

AC accuracy: 1% of reading Ѣɥ 1% of full-scale range AC frequency range: 1 Hz to 1 kHz, narrow band mode; 100 Hz to 20 kHz, wide band mode AC band limiting (filters): 18 user-selected frequencies of 3 low-pass or 15 band-pass > (Does not include probe error, unless otherwise specified) > UHS Probe Input type: Single Hall effect sensor Probe features: Measurement features: Linearity Compensation, Temperature Compensation, Auto Probe Zero, and Hot Swap Autorange, Max/Min Hold, Relative Mode, and Frequency Probe TypeRanges4-digitResolution Measurement resolution (RMS noise floor): Display...

Voltage Output 3 Range: 10 V Configuration: Scale: Resolution: User-specified (defaults same as Voltage Output 2) 16-bit, 0.3 mV Voltage output of compensated DC or RMS field value, generated by DAC (also used for field control) Update rate: 30 updates/s Accuracy: ѱ2.5 mV Noise: 0.3 mV Minimum load resistance: 1 k ѢĦ (short circuit protected) Connector: In 25-pin I/O connector Hall sensor compatibility: Front panel programmable sensitivity and serial number for user-supplied Hall sensorsee page 40 Probes and Extensions Extension cable compatibility: Calibrated or uncalibrated probe...

The Probe Connection The Model 455 is only half of the magnetic measurement equation. For the complete solution, Lake Shore offers a full complement of standard and custom Hall effect probes in a variety of sizes and sensitivities. One of ten common standard Hall probes is included with the Model 455. See page 13 for details on the ten Hall probes you can choose to get with the Model 455. Peak Measurement Mode Pulsed fields are measured in Peak mode, which is a natural extension of the high- speed data acquisition necessary for DSP operation. Fast instrument sample rates permit capture of...

Hall Effect Generators (Magnetic Field Sensors): The Model 455 will operate with a discrete Hall effect generator when a suitable probe is not available. Users can program nominal sensitivity and serial number into an optional MCBL-6 blank connector to provide all gaussmeter functions except field and temperature compensation. If no sensitivity information is available, the Model 455 reverts to resistance measurement. Extension Cables: The complex nature of Hall effect measurements make it necessary to match extension cables to the probe when longer cables are needed. Keeping probes and...

Computer Interface Two computer interfaces are included with the Model 455: serial (RS-232C) and parallel (IEEE-488). Both allow setup of all instrument parameters and read-back of measured values. The reading rate over the interface is nominally 30 readings per second. LabVIEW drivers are provided to instrument usersٗconsult Lake Shore for availability. Voltage Output 3 The third output provides a voltage proportional to measured field with the most signal processing of the three outputs. All probe compensation available to the display readings, including temperature compensation, can be...

L (in)D (in)A (in)Active area (in)Stem materialFrequency rangeUsable full scale ranges Corrected accuracy (% rdg)Operating temp range (װC)Temp coefficient (max) zeroTemp coefficient (max) calibrationContains temp sensorHMNA-1904-VR 4 0.1250.187 dia ѱ0.0050.005 0.0030.030 dia (approx)Fiberglass epoxyDC to 20 kHz HSE 3.5 G, 35 G, 350 G, 3.5 kG, 35 kGѱ0.20% to 30 kG and 0.25% 30 to 35 kG0 ѰC to +75 Cб0.09 G/Cб0.04%/CYes HMMA-2502-VR 2 б0.0630.25 dia 0.0060.015 ѱ0.005AluminumDC to 10 kHz HMNA-1904-VF 4 0.1250.187 dia ѱ0.0050.005 0.003Fiberglass epoxyDC to 800 Hz HST-4 35 G, 350 G, 3.5...